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Inflammation-induced mTORC2-Akt-mTORC1 signaling promotes macrophage foam cell formation. | LitMetric

Inflammation-induced mTORC2-Akt-mTORC1 signaling promotes macrophage foam cell formation.

Biochimie

Metabolic Disease Biology Laboratory, Department of Molecular Biology and Biotechnology, Tezpur University, Tezpur, 784028, Assam, India. Electronic address:

Published: August 2018

AI Article Synopsis

Article Abstract

The transformation of macrophages into lipid-loaded foam cells is a critical and early event in the pathogenesis of atherosclerosis. Several recent reports highlighted that induction of TLR4 signaling promotes macrophage foam cell formation; however, the underlying molecular mechanisms have not been clearly elucidated. Here, we found that the TLR4 mediated inflammatory signaling communicated with mTORC2-Akt-mTORC1 metabolic cascade in macrophage and thereby promoting lipid uptake and foam cell formation. Mechanistically, LPS treatment markedly upregulates TLR4 mediated inflammatory pathway which by activating mTORC2 induces Akt phosphorylation at serine 473 and that aggravate mTORC1 dependent scavenger receptors expression and consequent lipid accumulation in THP-1 macrophages. Inhibition of mTORC2 either by silencing Rictor expression or inhibiting its association with mTOR notably prevents LPS induced Akt activation, scavenger receptors expression, and macrophage lipid accumulation. Although suppression of mTORC1 expression by genetic knockdown of Raptor did not produce any significant change in Akt S473 phosphorylation, however, incubation with Akt activator in Rictor silenced cells failed to promote scavenger receptors expression and macrophage foam cell formation. Thus, present research explored the signaling pathway involved in inflammation-induced macrophage foam cells formation and therefore, targeting this pathway might be useful for preventing macrophage foam cell formation.

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Source
http://dx.doi.org/10.1016/j.biochi.2018.06.001DOI Listing

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